#bird{
    width:91px;
    height:71px;
    /*border:1px solid red;*/
    background-color: transparent;
    position: relative;
    top:-250px;
    animation:birdFly 20s infinite linear;
    -webkit-animation:birdFly 20s infinite linear;
    /*transition:all 0.3s;*/
    /*-webkit-transition:all 0.4s;*/
}
@-webkit-keyframes birdFly{
    0%{
        left:100%;
    }
    20%{
        left:80%;
    }
    40%{
        left:60%;
    }
    60%{
        left:40%;
    }
    80%{
        left:20%
    }
    100%{
        left:0%;
    }
}
.img{
    /*-webkit-animation:openDoor 1s linear;*/
    /*-webkit-transform-origin:0 50%;*/
    transition:all 2s;
    -webkit-transition:all 2s;
    /*-webkit-transform-origin:50% 50%;*/
}

